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[CodeGenObjC] Privatize some ObjC metadata symbols

Authored by erik.pilkington on Mar 9 2020, 12:17 PM.

Description

[CodeGenObjC] Privatize some ObjC metadata symbols

Nobody needs these symbols, so there isn't any benefit in including them. This
saves some code-size in Objective-C binaries. Partially reverts:
https://reviews.llvm.org/D61454. rdar://56579760

Differential revision: https://reviews.llvm.org/D75491

Details